Re: [Linux-ia64] about linux/ia64 mm

From: David Mosberger <davidm_at_hpl.hp.com>
Date: 2001-11-30 16:43:18
>>>>> On Thu, 29 Nov 2001 23:19:53 +0800, "=?gb2312?B?zMYg0+4=?=" <ytang5@hotmail.com> said:

  Tang> hi all, i was a little confused by linux/ia64 mm; as i know,
  Tang> linux requires physical memory to be mapped contiguously to
  Tang> kernel space( don't care highmem); and PAGE_OFFSET is defined
  Tang> to 0xe000000000000000 in linux/ia64; that's region 7, its page
  Tang> size is fixed to 64M(2.4.12). how could __get_free_pages()
  Tang> allocate such a big _page_? it's absolutely impossible.  so i
  Tang> think i made a big mistake somewhere, would someone help me
  Tang> out?  thx :-)

The page allocator works at the page frame level, which can be
configured to have a size of 4, 8, 16, or 64KB.  The large TLB
mappings are used merely to access the underlying memory (think of it
as a physical address space with a non-zero starting address).

	--david
Received on Thu Nov 29 21:43:36 2001

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